<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>CSS_SELECTION</title>
		<link rel="stylesheet" type="text/css" href="css/lesson3_selection.css"/>
	</head>
	<body>
		<!--1.选择器-->
		<!--1id-->
		<!--<div id="only">123</div>
		<div id="only1">234</div>-->
		
		<!--2.class-->
		<!--<div class="demo demo1">123</div>
		<div class="demo">234</div>-->
		<!--3.标签选择器-->
		<!--<span>123</span>-->
		<!--<div><span>234</span></div>-->
		
		<!--4.通配符选择器-->
		<!--<strong>111</strong>-->
	</body>
</html>
